Crushing-mill.



T. J'. STURTEVANT.

GRUSHING MILL.

APPLICATION FILED JULY9,1913.

11,072,059. Patented Sept. 2, 1913.

2 SHEETS-BEEBT 1.

T. J. STURTBVANT.

CRUSHING MILL.

APPLICATION FILED JULY 9, 1913.

1,072,059, Patented Sept. 2, 1913.

2 SHEETS-SHEBT 2.

N @Ho'onmdy UNITED STATES PATENT GFFICE.

THOMAS JOSEPH STURTEVANT, 0F WELLESLEY, MASSACHUSETTS, ASSIGNOR T0STURTEVANT MILL COMYANY, A. CORPORATION 0F MAINE.

CRUSHING-MILL.

Specication of Letters Patent.

Patented Sept. 2, 1913.

Application filed July 9, 1913. Serial No. 778,211.

To all whom it may concern Be it known that I, THOMAS J. S'rUR'rE-vAN'r, a citizen of the United States, residinor at Vellesley, in thecounty of Norfolk and State of Massachusetts, have invented ordiscovered certain new and useful Improvements in Crushing-Mills, ofwhich the following is a specification, reference being had therein tothe accompanying drawings.

This invention relates to that class of crushing mills employing rotarybeaters or hammers which coperate with gratos or crushing surfaces inthe chambers of the mills.

In crushing mills of the class referred to most eflicient operation issecured by such an adjustment 0f the' beaters or hammers as will enablethem to run closely adjacent to the gratos or crushing surfaces.` Owing,however, to the wear of the crushing parts, and more particularly to thewear on the rotary beaters or hammers, it is very desirable that aconvenient radial adjustment of the working positions of the rotarybeaters 0r hammersI should be provided for, to compensate for Wear, sothat the adjustment may be quickly and readily effected, and the presentinvention has for its object to supply this desideratum.

In carrying the present invention into effect the rotary carrier for therotary beaters or hammers preferably comprises two sets of heads ordisks, the inner heads or disks being splined or otherwise secured to'the crushing mill shaft, so as to rotate therewith, while the outerheads or disks are adapted to have a limited circular adjustment, withheads or disks, when the clamping bolts which normally secure theseheads or disks together are loosened. The inner heads or disks areprovided at .their peripheries with open radial slots for the receptionof the pivot-bars of the rotary beaters, and the outer heads or disks,which overlap the ends of the said pivotbars, are provided with internalcam portions against which the outer faces of the said pivot-bars bear.Thus when the clamping bolts by which t-he two sets of heads or disksare normally rigidly secured together, are loosened a circularadjustment of the outer heads or disks relative to the inner fixed headsor disks will permit au in or out radial adjustment of the pivot-bars soas i reference to the; fixed to bring the rotary beaters in any desired-relation to the gratos or crushing surfaces 1n the chamber of the mill,such circular adjustment being permitted by slots in the inner heads ordisks and through which slots said clamping bolts pass. The circularadjustment of the outer heads or disks, or the relative adjustment ofsaid heads or disks, referred to, may be effected in different ways, aswill hereinafter appear. In the accompanying drawings Figure 1 1s adiametric sectional elevation of the rotary arts of a rotary beater millembodying one orm of the present invention. Fig. 2 is a section of thesame, on line 2-2, Fig. 1. Figs. 3 and 4 are views similar to Figs. 1and 2 respectively, showing a different form of the present inventionfrom that illustrated in Figs. 1 and 2. Fig. 5 is a detail view of apart shown in Figs 8 and f1.

Referring first to Figs. 1 and 2 of the drawings, 12 denotes the rotaryshaft of a crushing mill and to which shaft are splined or otherwisesuitably fixed inner heads or disks 13 provided at their peripherieswith radial slots 14 for the reception of pivotbars 15 on which aremounted thc swinging beaters or hammers 1G, herein shown as beingU-shaped so as to constitute swinging bails. Mounted on the shaft 12outside of the heads or disks 13 are the adjustable heads or disks 17provided with a series of internal eccentric or cani surfaces 18overlapping the ends of the pivot-bars 15 and against which the outerfaces of the ends of said pivot-bars bear. The two sets of heads ordisks 13 and 17 are securedv together in working position by means ofclamping bolts 19 which fit closely in holes in the outer heads ordisks, but pass loosely through curved slots 19 in the inner heads ordisks. The inner heads or disks are held apart by a hollow cylindricalmember 20 between the ends of which and the outer heads or disks 17 theinner heads or disks are clamped when the nuts 2l on the bolts 19 aretightened. Secured to the shaft 12 is a gear wheel 22 with which meshesa pinion 23 on one of the bolts 1S), said bolt being provided with asquared end 24 which is adapted to receive a wrench lby which the Saidbolt may be turned when relatively fixed gear wheel 22 on the shaft 12will cause a circular adjusting movement to be imparted to the outerheads or disks 17 for the purpose of changing the radial positions ofthe pivot-bars 15 and likewise changing the radial working positions ofthe swinging beaters 16.

In the construction shown in Figs. 3 and most of the parts, exceptingthe means for effecting the circular adjustment of the outer heads ordisks relatively to the inner heads or disks, are similar to thecorresponding parts in Figs. 1 and 2 just described, and are similarlydesignated by reference numerals. In this different form of theinvention, however, the shaft 12 is provided with a straightlongitudinal slot 25, and the inner cylindrical member 26 is providedwith spiral slots 27 for the reception of the ends of a cross adjustingbar 28 movableV in said straight slot 25 and secured to a bar 29longitudinally disposed in a portion of the shaft 12 which is madehollow for its reception. The 'longitudinal adjusting bar 29 is formedpartly hollow and is screwthreaded internally for the reception ofascrew-threaded portion of anadjusting rod 30 which extends outwardbeyond the end of the shaft 12 where it is provided with a squared endportion 3l for the reception of a wrench by which it may be' turned. Theadjusting rod 30 passes through a bushing 32 screwed into the end of theshaft 12 and the said rod is provided with an enlargement or boss 33which abuts against said bushing to prevent endwise movement of said rodwhen it is turned. The adjusting rod may be fixed in any desiredposition by a lock nut 34: which will, of course, be loosened when thesaid rod is to be turned. The bolts 19, passing loosely through theslots 19 in the inner heads or disks 13, are encircled by spacingWashers or bushings 35 disposed in lsaid slots. These spacing washers orbushings are of suflicient length to prevent the fixed inner heads ordisks from being clamped when the nuts 21 on the bolts 19 are tightenedto secure the outer heads or disks to the flanges of the cylindricaladjusting member 26.

From the foregoing it will be understood that a circular adjustment ofthe outer heads 17 may be effected, for varying the working positions ofthe pivot-bars 15, by

turning the adjusting rod 30, thus causingthe adjusting bar 28 to travelin the straight slot 25 in the shaft 12 and the spiral curved slots 27of the cylindrical member 26, thereby effecting a partial rotation ofthe said cylindrical member and a corresponding partial rotation of theouter heads or disks 17, any tendency to a turning movement of theadjusting bar 28 being resisted by the walls of the straightlongitudinal slot 25 in the shaft 12.

The form of the invention last described offers the advantage ofenabling the radlal adjustment of the pivot-bars, for effecting a radialadjustment of the working posi- I and described, nor to the feature ofmaking the outer heads or disks adjustable relative to the inner headsor disks, as it will be understood that either set of these heads ordisks might be made adjustable relative to the other set without'changing the result e'ected by a relative adjustment of these heads ordisks.

Having thus described my invention I claim and desire to secure byLetters Patent l. In a crushing mill, the combination with a rotaryshaft, of a 4rotary carrier comprising two sets of heads or disks oneset of which is fixed to said shaft while the other set is capable ofcircular adjustment relative to said fixed set, one set of said fixedheads or disks being provided with open peripheral slots and the otherset of said heads or disks being provided with eccentric or cam portionsoverlapping said open peripheral slots, pivot-bars mounted in said slotsand retained in working positions by the said overlapping eccentric orcam portions, and swinging beaters carried by said pivot-bars.

2. In a crushing mill, the combination with a rotary shaft, of a rotarycarrier comprising two sets of heads or disks one set of which is fixedto .said shaft while the other set is capable of circular`adjustmentrelative'to said fixed-set, one set of said fixed heads ordisks being provided with open peripheral slots and the other set ofsaid heads or disks being provided with eccentric or cam portionsoverlapping said open peripheral slots, pivot-bars mounted in said slotsand retained in workingpositions by the said overlapping eccentric orcam portions, swinging beaters carried by said pivotbars, an innercylindrical member, and clamping bolts. passing through portions of saidmember and said heads or disks.

3. In a crushing mill, the combination with a rotary shaft provided witha straight, longitudinalslot, of a rotary carrier comprising two sets ofheads or dlsks one set of which is fixed to said shaft while the otherset is capable of ,circular adjustment relative to said fixed set, oneset of said fixed heads or disks being provided with open peripheralslots and the other set of Lovaoua said heads or disks being providedwith eccentric or cam portions overlapping said open peripheral slotspivot-bars mounted in said slots and retalned in working positions bythe said overlapping eccentric or cam portions, swinging beaters carriedby Said pivot-bars, an inner cylindrical member provided with curvedslots, clamping bolts passing through portions of said member and saidheads or disks, a cross adjusting bar movable inv said straight andcurved slots, and means for operatingr said cross adjusting `tar tocause it to travel in said slots, for efiectin a partial turningmovement of the said adjustable heads or disks relative to said fixedheads or disks.

4. In a crushing mill,` the combination with a rotary shaft providedwith a straight, longitudinal slot, of a rotary carrier comprising twosets of heads ordisks one set of which is fixed to said shaft while theother" set is capable of circular adjustment relative to said fixed set,one set of said fixed heads or disks being provided with eccentric orcam portions overlapping said open peripheral slots, pivot-bars mountedin said slots and retained in working positions by the said overlappingeccentric or cam portions, swinging beaters carried by said pivotbars,an inner cylindrical member provided with curved slots, clam ing boltspassin through portions of sai member and sai heads or disks, a crossadjustin bar movablein said straight and curve slots, and

means for operatin said cross adjustin bar to cause it to trave in saidslots, for e ecting a partial turnin movement of said adjustable headsor dis relative to said fixed heads or disks, said operating meanscomprising a longitudinal adjusting bar to which said cross adjustingbar is attached, and which longitudinal bar is formed partly hollow andscrew-threaded internally, and a rotatable adjusting rod having ascrewthreaded portion engaging the screwthreaded j usting bar.

5. In a crushing mill, the combination with a rotary shaft, of a rotarcarrier comprising two sets of heads or dlsks one set of which is fixedto said shaft while the other set is capable of circular adjustmentrelative to said fixed set, one set of said fixed heads or disks beingprovided with open peripheralslots and the other set of said heads ordisks being provided with eccentric or cam portions overlapping saidopen peripheral slots, swinging beaters, and pivots for said swingingbeaters, said pivotsA being mounted in said slots and retained inworking positions by the said overlapping eccentric or cam portions.

In testimony whereof I aiix my signature, in presence of two witnesses.

THOMAS JOSEPH STURTEYANT. Witnesses:

L. H. STUn'rEvANT, W. V. Ennis.

portion of said longitudinal adn

